Workflow list A - populate List B

I have a workflow in list A, I want to create list item in another ListB. I have added List B site to the data source library - the puzzle ishow do I populate the fields for a new item in List B?? Create a newworkflow (the only thing the workflow looks at the list attached to theworkflow) if anyone has a few steps on this I would be happy with somedirection from this point.

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